Introduction: My name is Dr. Pierre Goyette, I am a enchanting, powerful, jolly, rich, graceful, colorful, zany person who loves writing and wants to share my knowledge and understanding with you. Reviews: 85% of readers found this page helpful, Address: Apt. [14], Dissolution of slags generate alkalinity that can be used to precipitate out metals, sulfates, and excess nutrients (nitrogen and phosphorus) in wastewater treatment. Not only that, but it can even reduce acids that have built up in soils. Some of the other names for slag glass come from its historical beginnings. Real slag glassware will also never just be one solid color, it will always be blended. Though it's easily mistaken for other glass products produced around the same time period, such as stained glass, slag glass has its own unique look and slag glass items can fetch a wide range of prices. Antique Vtg Sheffield Style Hanging Ceiling Light Lamp Fixture Old Etched Shades. Challinor Taylor and Co. was an early U.S. producer of slag glass and created slag glassware in higher quantities than most other glass manufacturers. Slag glass has a really unique look that sets it apart from many other styles of vintage glassware. There is another theory that slagware, and some other glass decorated with multi-colored enamels, were made up from odds-and-ends of glass left over at the end of the day, Webber reiterates.3, The most common base colors include white, cream, primrose, and blue. [25], Fine slags and slag dusts generated from milling slags to be recycled into the smelting process or upcycled in a different industry can be carried by the wind, affecting a larger ecosystem. It is often called Leland Blue, as the most well-known place to find it is Leland, Michigan. Antique Answers was started to provide answers to my own questions, which will hopefully become a great resource for others interested in their own vintage heirlooms. Slag that has a low percentage of alumina to silica becomes glassier, and rapid cooling also makes it more glasslike. Some of these names can be used synonymously, but some of them have slightly different meanings that a serious collector should be aware of. She co-founded the Costume Jewelry Collectors International, a global educational website. Ft. 2031 E Rice Dr, Tempe, AZ 85283. (Video) Is it slag? [25] The calcium silicates (CaSiO4) in slags react with water to produce calcium hydroxide ions that leads to a higher concentration of hydroxide (OH-) in ground water. One of the best ways to check if your slag glass is real is to look for the names and marks of manufacturers. For the British slang term for a promiscuous woman, see, "Characteristics and environmental aspects of slag: A review", "Iron and Steel Statistics and Information", "worldsteel | Steel industry co-products position paper", "10 - Properties of SCC with industrial by-products as aggregates", "The chemical composition of glass in Ancient Egypt by Mikey Brass (1999)", "4 - Application of blast furnace slag in civil engineering: Worldwide studies", "The long-term accelerated expansion of various ladle-furnace basic slags and their soil-stabilization applications", "CHAPTER 7:Diverse Applications of Slags in the Construction Industry", "High Performance Cement for High Strength and Extreme Durability by Konstantin Sobolev", "Autojen jakohihnojen rikkoutumisen taustalla ferrokromikuonan eli OKTO-murskeen aiheuttama kuluminen", "CHAPTER 8:Environmental Applications of Slag", "Production, characterisation, utilisation, and beneficial soil application of steel slag: A review", "Effective CO2-specific sequestration capacity of steel slags and variability in their leaching behaviour in view of industrial mineral carbonation", "Mineralization of Carbon Dioxide: A Literature Review", "A review on steel slag valorisation via mineral carbonation", "A Review of the Influence of Steel Furnace Slag Type on the Properties of Cementitious Composites", "Some Effects of Carbon Dioxide on Mortars and Concrete", "Controls on CO2 Mineralization Using Natural and Industrial Alkaline Solids under Ambient Conditions", "CHAPTER 6:Environmental Impact of Slag Particulates", "CHAPTER 5:Slag Leaching Properties and Release of Contaminants", "Geochemistry of Extremely Alkaline (pH > 12) Ground Water in Slag-Fill Aquifers", "Direct CO2 emissions in the iron and steel sector by scenario, 2019-2050 Charts Data & Statistics", https://en.wikipedia.org/w/index.php?title=Slag&oldid=1141642075, Short description is different from Wikidata, Articles with unsourced statements from June 2021, Creative Commons Attribution-ShareAlike License 3.0, This page was last edited on 26 February 2023, at 02:13. Real slag glass will not have a solid color but rather a blended, marble look. United States. Instead of taking your glass to the grinder to clean your edges, just run the surface of the stone against the area of your glass that needs smoothing. Sea glass and other treasures from the beaches of southern Spain. During the molten stage, before pressing, glassmakers have the opportunity to add different compounds and ingredients to produce a unique effect in the glass. It was also ground into powder to add to glazes for use in ceramics. It can seem strange to think of putting metal byproducts into a beautiful piece of glass, but it is super common to use a wide selection of additives and compounds to give glassware unique looks. $35.00. It was primarily blue or green and was formerly chipped away and melted down to make glassware products and jewelry. Older pieces are worth more because as time goes on, antique slag glass is harder to find. Secure .gov websites use HTTPS The light shining through the marbled color creates a really unique effect. Known for its opaque appearance and its organic striations akin to marble or stone, slag glass was a popular addition to many decorative pieces, particularly in lamp designs. The colors of slag glass are also a great way to identify authenticity. Metal furnace slag can range from glassy to dull and stony in appearance and, when scratched, can range from hard to chalky. Slag is the glass-like by-product left over after a desired metal has been separated (i.e., smelted) from its raw ore. Slag is usually a mixture of metal oxides and silicon dioxide. or Best Offer +$8.95 shipping. $24.95 (15% off) Blue Slag glass blue Obsidian, Manmade Aqua blue obsidian is the stone of swimmers and can help overcome fear of the water. Sometimes hard rock mining can give the environment a bit of excess acid, in the form of acid mine drainage. This particular specimen of slag has green coloration, and a unqiue pumice-like appearance in spots where it is unpolished. I use the term here to also include any man-made, rock-like by-product of heating things to high temperature. Youll rarely find marbleized glass dating earlier than 1860, even though the technology existed before this point.2. Not all Fenton slag glass will be worth quite as much, so each piece in a collection should be evaluated based on the style and color. Is slag environmentally friendly? [26] The IEA report and the WSA project a continual increase in demand in the coming years prompting greater efforts to move toward a circular economy. Slag glass is a term used to describe a type of colored pressed opaque glass made using the "slag" left over during the iron smelting process. How do you identify glass slag rocks? Ruby Red LLC is compensated for referring traffic and business to these companies. (817) 251-1668. Learning how to identify and value this glass can help if you are looking to collect or just learn more about this interesting glassware. Hard and durable, steel slag makes a perfect aggregate for covering parking lots, achieving a lasting result. You can find antique slag lighting fixtures for sale on websites such as Etsy for as low as $20 or as much as $16,000. Ruby Red LLC also participates in affiliate programs with Awin and other sites. In addition, slag glass panels were used in lamps, jewelry boxes, and other collectibles. Blast furnace slag (BFS) is a by-product from iron production in blast furnaces, which are fed by a mixture of iron-ore, coke and limestone. It may also have higher free CaO and MgO content, which are often converted to its hydrated forms if excessive volume expansions are not desired. Two vintage brown Sowerby figurines can sell for two completely different processes depending on how the marbling came out. Careful consideration of the slag type used is required, as the high CaO and MgO content can lead to excessive volume expansion and cracking in concrete. Slag glass gets its name from slag, or the byproduct of steel production. 2023 LoveToKnow Media. $59.99 + $21.56 shipping. Below we will teach you to have to identify slag glass and give you a greater understanding of its value. What is it called when you wake up during surgery but can't move? The next step in determining old from new is looking for a maker's mark on the bottom of a piece. Sellers with highest buyer ratings; Starting in the late 1800s and through the mid-1900s, both England and U.S. manufacturers were creating slag glass both with and with the use of iron slag. A product that is unwanted during the smelting process, and would otherwise be wasted, is put to good use in the glass business. Remember, the most common way to make slag glass was by skimming silicate material from the top of molten iron. Save my name, email, and website in this browser for the next time I comment. For example, simple slag glass items are priced similarly to depression glass. These include items ranging from small figurines to larger bowls made of red glass several decades ago, so they are collectible but not yet antique. While collectible, the price range varies greatly depending on the item and manufacturer. After the piece is shaped and cooled, the slag produces a streaky marbled look. . Its a shame we cant come up with a nicer name. Produced by Hocking Glass Company around 1929 to 1933, this green glass cup is a common find. Blue Slag Glass actually comes from different sources, some is from the creation of glass items such as a vase, while other Blue Slag Glass comes from the smelting iron ore, both are the combination of a natural substance with glass or into the making of glass. Slag glass was also created by taking two colors of glass and combining them to create what was called "mosaic glass" in 1902 in Pennsylvania by glassmakers Thomas Dugan and Harry Northwood. Atterbury & Company, Challinor Taylor & Company, and H. Northwood Glass Company are some well-known manufacturers from the United States. Two other common characteristics of slags are that they are glassy (vitreous) and contain of vesicles (gas bubbles). However, sometimes too much fertilizer is used and the excess phosphate ends up in the local stream or lake. Pulverized silicate slag is white in color, and will show up creamy in the finished glassware. The value of slag glass antiques ranges from $20 $20,000. The value of slag glass is determined by the rarity of the item and the color. Most homes in the late 19th century and even some older homes today could be found using a slag glass lampshade as decor. What was Juliet's last words before she died? As with any glass type, or art in general, different circumstances and people have adopted different names for slag glass. Challinor created slag glass slightly differently than the original process which uses true slag. Top Rated Plus. Slag glass was often used in lampshade production as well as for crafting many different types of decorative objects. 10 Rarest and Most Valuable Coins in the World, Ways to Test Antiques and Collectibles With a Black Light, 50 State Quarters, D.C., and U.S. I would like to send you pictures, but am not sure how. Blueberry and cream were one of the first slag glasses founded by Gateshead who lived in England. 2 Baths. [17][18] Across these CCS methods, slags can be transformed into precipitated calcium carbonates to be used in the plastic, and concrete industries and leached for metals to be used in the electronic industries. Figuring out who made a piece, and how old it is, can be a bit more tricky. Slag is also used as aggregate in asphalt concrete for paving roads. This is because the top manufacturers of the day often did leave any identifying brand marks on the fixtures. In this case, the slag is termed synthetic. Manufacturers used the glass in molds to make bowls, compotes, vases, plant cache pots, and more. If the item is in good condition, with no cracks, discoloration, or signs of neglect, it will be worth more. Required fields are marked *. Slag glass is a type of pressed glass that is known for its brilliant and vibrant colors. Iron meteorites are dense and therefore heavier for their size than most naturally-occurring rocks. Because of its exotic patterns and colors, this Shippersea Glass is called "dragon glass." Is Slag Glass Natural? [5], Slags can serve other purposes, such as assisting in the temperature control of the smelting, and minimizing any re-oxidation of the final liquid metal product before the molten metal is removed from the furnace and used to make solid metal. A good example is steelmaking slag: quicklime (CaO) and magnesite (MgCO3) are introduced for refractory protection, neutralizing the alumina and silica separated from the metal, and assisting in the removal of sulfur and phosphorus from the steel. You can determine the age of a piece of slag by finding the date of production. Finally, a Bradley & Hubbard slag glass lamp sold for $584, typical for that style and age of light. Glassmakers have achieved a similar-looking marbled effect to slag by simply mixing two different colors of glass together. It can also be called Malachite glass, in reference to the stone. Slag (middle photo) is much lighter per unit volume than iron meteorites, and is frequently multicolored (blue, red and purple iridescence). If the item does not have any names or marks, the piece likely is a fake. Examine the color. Mychelle is a writer and web designer who is passionate about a wide variety of topics and enjoys sharing her knowledge with readers. Slag from steel mills in ferrous smelting is designed to minimize iron loss, which gives out the significant amount of iron, following by oxides of calcium, silicon, magnesium, and aluminium. This is one of the most common uses for slag glass, and you'll see many slag glass chandeliers and other fixtures in antique shops. Instead of slag, they mixed purple glass with a white-colored glass that did not contain any iron slag. Density: Meteorites are usually quite heavy for their size, since they contain metallic iron and dense minerals. Neglect, it will always be blended, challinor Taylor & Company, and H. glass... 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First slag glasses founded by Gateshead who lived in England the excess phosphate up! Greater understanding of its value mychelle is a writer and web designer who is passionate about a wide variety topics. Pumice-Like appearance in spots where it is Leland, Michigan apart from many styles... Of slag has green coloration, and a unqiue pumice-like appearance in spots where is! Knowledge with readers rarely find marbleized glass dating earlier than 1860, even though technology... Vesicles ( gas bubbles ) appearance in spots where it is Leland, Michigan range varies depending... Glass can help if you are looking to collect or just learn more about this interesting glassware,! A greater understanding of its value ways to check if your slag glass lampshade decor. Will not have a solid color, it will be worth more because as time goes on, slag...
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